IBM 3770 manual Simulating Sending and Receiving Files with the Demo

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3770Link

Simulating Sending and Receiving Files with the Demo

For the purposes of this demo, the following rules apply when sending or receiving files:

∙You may send a file at any time you are connected. A connection is achieved through the Auto-Dial, Auto-Answer, or Connect menus in 3770Link GUI, or through the DIAL, CONN, or ANS script commands in 3770Link SO.

∙You will automatically receive a single file on the first configured LU after a brief pause each time that LU is logged on. 3770Link GUI is awaiting a transmission any time the line is connected, and is thus always ready to receive a file. With 3770Link SO, however, you must execute the RCV command in order to receive a file. The “rcvfile.txt” file included on the 3770Link diskette is used in the simulation of all received files.

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Contents Demo Version User’s Guide Table of Contents 3770Link SNA/RJE EmulationNotational Conventions 3770Link Demo Version User’s Guide Ordering InformationTechnical Support Introduction to 3770Link 3770Link Features Emulation FeaturesRJE Server Features Software Installation Media and FilesRunning 3770Link GUI and Simulating an Interactive Session 3770LINK.HLPReceive Complete, 131 Records Received Running 3770Link SO and Simulating an Unattended Session Simulating Sending and Receiving Files with the Demo Script Commands Script FilesSample Script Files Disc Quit Disc 3770Link Script Language IFERROR= nnnn label Iferror nnnn label Dial xxx-xxx-xxxx /t=x /m=xForm formname If label1, label2Iffile filename label Ifnfile filename labelPrint file ptr Rename filename1 filename2 Rename filename1 to filename2Command Line Options Ffile

3770 specifications

The IBM 3770, introduced in the mid-1970s, was a pioneering multi-user data station known for its innovative design and functionality, aimed primarily at supporting online transaction processing. As one of the early efforts in integrating computers with communication technology, the 3770 set a foundation for subsequent advancements in the field.

One of the standout features of the IBM 3770 was its ability to support multiple user connections simultaneously. This multi-user capability allowed organizations to connect various terminals to a central computer, facilitating efficient data entry and retrieval processes. Each terminal could communicate with the mainframe, enabling users to access real-time data and execute transactions concurrently, which was revolutionary for its time.

The 3770 utilized a proprietary communication protocol that leveraged synchronous serial communication, ensuring reliable data transmission over telephone lines and enabling the automation of remote data entry. This technology reduced the need for physical interaction with centralized data processing systems, leading to increased productivity and efficiency in organizational workflows.

In terms of characteristics, the IBM 3770 was equipped with a dedicated processor for handling input and output operations. This feature offloaded routine tasks from the mainframe, optimizing overall performance and freeing up computational resources for more intensive processing activities. Additionally, the system was designed to support a variety of input devices, including keyboards and card readers, accommodating different user preferences and operational needs.

The architecture of the IBM 3770 included a unique data format that streamlined the handling of transactions. This format allowed for easy integration with existing databases and applications, making it an attractive solution for businesses looking to modernize their data processing capabilities. The system also featured built-in error detection and correction routines, which ensured data integrity during transmission.

Moreover, the IBM 3770 was recognized for its flexibility and scalability. Organizations could easily expand their networks by adding more terminals or connecting additional mainframe storage. This scalability was crucial for businesses experiencing growth, as it eliminated the need for frequent system overhauls.

In summary, the IBM 3770 was more than just a data station; it was a significant step forward in online transaction processing, combining innovative communication technologies with multi-user functionality. Its features, such as dedicated processing, support for various input devices, and scalability, set the stage for future advancements in data systems and remain influential in shaping the landscape of computing.
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